What's the difference among BlitzWolf VR, Samsung Gear VR and Google Cardboard? Samsung VR is with micro male interface for Samsung phones and magnet sensor to hold the phone, but x2.6 price as BlitzWolf. Google Cardboard is rougher built but cheaper, the earliest generation of VR. BlitzWolf VR is built with the same quality as Samsung VR with comfortable leather, compatible with all phones within sized 6 inch*3.2 inch, price much cheaper than Samsung and much better controllable. How to make sure whether the VR suits your phone or not? Check the length of you phone, if it's longer than the $1 bill, then it must not suit, otherwise it will suit your phone. (Nexus 6P is too big to be held according to customer feedbacks!)Use your earphone while watching!You can still plug your earphone through the slit of the VR as usual while using. Must Know 1. Please make sure your phone is holdable by the VR, sized within 6 inch*3.2 inch.2. You can't watch videos through it with eyeglasses on, this VR may not be clear for over 600 degrees of myopia.3. This VR can't automatically transform images to 3D format, you need to download APPs with 3D format video or watch panorama videos on YouTube, QR code and video source can be found on Google. Package Included > BlitzWolf VR Glasses > Glasses cloth > User Manual > Warranty Card